Cyperus congestus Vahl

Dense Flat-sedge

Enum. Pl. 2: 358 (1805) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Naturalised

Tufted perennial with very short thick rhizome, often apparently annual. Culms triquetrous, smooth, slightly swollen at base, mostly 20–60 cm high, 1–3 mm diam. Leaves not septate-nodulose, shorter or longer than culms, 2–6 mm wide. Inflorescence simple or compound with 2–7 branches to 10 cm long, or head-like; spikes dense, broad-cylindric to hemispherical, 1–5 cm diam.; involucral bracts leaf-like, 2 or 3 longer than inflorescence. Spikelets flattened, numerous per spike, 10–28 mm long, 1–2 mm wide in side view, 8–24-flowered; rachilla winged, persistent; glumes acute, with sides 3–4-nerved, red-brown, c. 4 mm long; stamens 3; style 3-fid. Nut trigonous, narrow-obovoid, dark brown to black, c. one half as long as glume, c. 1.5 mm long, c. 0.6 mm diam. Flowers spring–summer.

*CVU, *EGL, *EGU, *GipP, *Gold, *HNF, *HSF, *OtP, *VRiv, *VVP. Also WA, SA, NSW, ACT, Tas. Native to southern Africa. Weed by roadsides and in damp ground.

Source: Wilson, K.L. (1994). Cyperaceae. In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2018-01-29
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Lilianae
order Poales
family Cyperaceae
genus Cyperus
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Cyperus congestus in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Cyperus congestus in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present naturalised
Victorian Riverina present naturalised
Gippsland Plain present naturalised
Otway Plain present naturalised
Goldfields present naturalised
Central Victorian Uplands present naturalised
East Gippsland Lowlands present introduced
East Gippsland Uplands present introduced
Highlands-Southern Fall present naturalised
Highlands-Northern Fall present naturalised

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory